I like this so much, I re-read it after catching up with Yuzuchiri's current series: Mousou Sensei, which is kind of the opposie of this one in many ways.
I still think it's his best work so far, and could use a sequel or at least a spinoff when he's done with Mousou Sensei. So many side couples to explore, and even the main couple never really had a real resolution.
The older brother and sister could get married for example, making Himeno and Ouji siblings in law. The teacher's married life could be explored, especially if their teaching styles for kids are different. Plus there's all the other kids, none of whom got any real resolution.
Even if it's a short series, I'd love to see a followup to this one. That said, Mousou Sensei's the fanservice-filled pervy kind of series that seems to go on forever, so who knows if Yuzuchiri will ever have time.